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annotate core/src/luan/impl/UnmExpr.java @ 576:4723d22062ce

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remove LuanBit
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 13 Jul 2015 20:38:26 -0600
parents b48cfa14ba60
children 60c549d43988
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4eaee12f6c65 move luan/interp to impl
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanFunction;
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5 import luan.LuanException;
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6 import luan.LuanElement;
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7 import luan.LuanTable;
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10 // unary minus
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11 final class UnmExpr extends UnaryOpExpr {
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12
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13 UnmExpr(LuanElement el,Expr op) {
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14 super(el,op);
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15 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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18 Object o = op.eval(luan);
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19 if( o instanceof Number )
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20 return -((Number)o).doubleValue();
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21 luan.push(el,null);
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22 try {
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23 if( o instanceof LuanTable ) {
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24 LuanFunction fn = luan.getHandlerFunction("__unm",(LuanTable)o);
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25 if( fn != null ) {
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26 return Luan.first(fn.call(luan,new Object[]{o}));
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27 }
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28 }
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29 throw luan.exception("attempt to perform arithmetic on a "+Luan.type(o)+" value");
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30 } finally {
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31 luan.pop();
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32 }
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33 }
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34 }